2007 Toyota Matrix Questions

Car died, sat for 20 minutes & started, ran 2 minutes and died. Started next morning to load on transport to take to dealer. Dealer put computer on it for a whole day, ran parts with it and let idle. Ran perfect. Has run great for 30 days and now doing it again. No codes or lights.

No gas is delivered to the engine, in drive, and all it will do is move forward at idle speed. This happened at low speed, gong up a hill, and also on level ground at high speed, and once upon turning on the ignition, the transmission slammed into drive, and there was no response , just idling ahead, when I stepped on the gas.

How much should it cost to replace just the o-ring on the Timing Chain Tensioner on 2007 Matrix. I just had it repleced at the recommendation of the Toyota dealer at a cost of $123.97. Did I get ripped off?

I am doing my basic maintenance this time and don't have any technical manuals. For the 30K maintenance I am to re-torque the drive shaft bolt and have not done this before, but now work at a place that has the correct tools and figured I could do it myself. What is the correct torque in foot pounds? Also is there one resource/manual that is worth having to do some maintenance and minor repairs myself? Thanks, Dave